#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
extern int bin_search(int arr[], int left, int right, int key);
int main()
{
	int key = 0;
	scanf("%d", &key);
	int arr[10] = { 1,2,3,4,5,6,7,8,9,10 };
	printf("%d", bin_search(arr, 0, 9, key));
	return 0;
}